new storage engine

[lysevi]

• - mapped file.
• - COLA:
  • - addLink(address, maxtime)
  • - queryInterval
  • - return links ordered by time.
  • - queryTimepoint
  • - erase value: mark link as removed and dont return as result.
    • - on merge levels?
  • - interface to fsync
  • - COLA fsync updated values.
  • - aggregate values in index?
  • - less allocations
  • - index format: |header| lvlHaders | COLA| ??
• - Volume:
  • - fixed size
  • - memory mapped file.
  • - |Header| Index1 | Index2 => <= Chunk3 | Chunk2 | Chunk1|
  • - add chunk and update index
  • - query chunk by interval
  • - query chunk to timepoint.
  • - addChunk - status as result:
    • - index region is full
    • - chunk region is full - can owerwrite
    • - success
  • - file flush politics:
    • - max speed
    • - safety
  • - minMaxes of time in header.
  • - readonly mode.
  • - erase value:
    • - from index
    • - mark chunk as removed.
    • - remove empty index?
  • - owerwrite old.
  • - owerwrite chunk with same chunk_id (not filled).
  • - thread safety.
• - VolumeManager.
  • - common test pass.
  • - thread safety.
  • - integrate to engine.
  • - decrease reads.
  • - check volume header minmaxes when read.
    • - apply_for_each_volume recv. predicate.
  • - open volumes as 'readonly' on read
  • - one or many volumes
  • - owerwrite old value if single volume.
  • - profile
• - multiporcess mode

---

• - remove:
  • - chunk repack
  • - WAL
  • - PAGE
  • - memory storage
  • - manifest?
  • - strategy
  • - dropper
  • - unused options
  • - flag from measurement?

---

• - new compression method
  • - oriented to bit (currently to byte).

---

• - need update changelog.
• - need update readme.
• - need update protocol version.
• - need update storage version.
• - need update settings save/load.
• - need example.
• - need update papers.